OBS网络竞争解决机制研究

作为下一代互联网关键技术之一的光突发交换(OBS)技术已受业界的广泛关注.结合国内外最新的研究动态,探讨了解决OBS网中突发包竞争的解决方案,并对这些技术的优缺点进行了分析比较.     

粗粒度可重构结构的性能估计方法

在设计初期,估计粗粒度可重构结构的性能,对粗粒度可重构结构设计具有指导意义.在考虑局部数据存储器结构以及局部数据存储器与可重构阵列的接口结构的情况下,建立了粗粒度可重构结构的参数模型,使用改进的螺旋形绑定策略将应用算法DFG(Data Flow Graph)中的算子绑定到可重构阵列的处理单元上,提出了一种粗粒度可重构结构的性能估计方法.应用实例表明,在设计初期,该方法能得到周期精确的估计结果,有效地指导粗粒度可重构结构的设计.     

差异化营销策略研究——以"欧西莱光电子公司"为例

在中国市场上,许多行业都面临同质化的问题.因此,制定一个与众不同的营销策略,形成差异化优势,是值得考虑的发展模式.本文以“欧西莱光电子公司“为例,从产品、客户需求、客户服务和市场策略等方面来讨论差异化营销.     

逆变电源并联技术的现状与发展

分析了逆变电源并联的基本原理，介绍了并联技术发展过程中出现的几种控制方案，并针对各种并联方案的优缺点讨论了今后逆变电源的发展趋势。     

关于拓扑对策中的I~2(K)I(K)问题

证明了如果空间类κ为D-空间类或闭遗传不可约空间类,则I(κ)(∈)κ.这一结果对于κ为D空间类和闭遗传不可约空间类,肯定地回答了I(κ)是否包含I2(κ)问题.     

Initial guess by improved population-based intelligent algorithms for large inter-frame deformation measurement using digital image correlation

Digital image correlation (DIC) has received a widespread research and application in experimental mechanics. In DIC, the performance of subpixel registration algorithm (e.g., Newton-Raphson method, quasi-Newton method) relies heavily on the initial guess of deformation. In the case of small inter-frame deformation, the initial guess could be found by simple search scheme, the coarse-fine search for instance. While for large inter-frame deformation, it is difficult for simple search scheme to robustly estimate displacement parameters and deformation parameters simultaneously with low computational cost. In this paper, we proposed three improving strategies, i.e. Q-stage evolutionary strategy (T), parameter control strategy (C) and space expanding strategy (E), and then combined them into three population-based intelligent algorithms (PIAs), i.e. genetic algorithm (GA), differential evolution (DE) and particle swarm optimization (PSO), and finally derived eighteen different algorithms to calculate the initial guess for qN. The eighteen algorithms were compared in three sets of experiments including large rigid body translation, finite uniaxial strain and large rigid body rotation, and the results showed the effectiveness of proposed improving strategies. Among all compared algorithms, DE-TCE is the best which is robust, convenient and efficient for large inter-frame deformation measurement.     

Obtaining the dividends-penalty identities by interpretation

The dividends-penalty identity is a relation between three functions: the discounted penalty function without dividends, the discounted penalty function if a barrier dividend strategy is applied, and the expected discounted dividends until ruin. The classical model of risk theory is modified in that the deterministic premiums are replaced by a compound Poisson process with exponential jumps. In this model, the dividends-penalty identity is new and can be derived by interpretation. Then the dividends-penalty identity in the classical model is obtained as a limit.     

Nanoscale Science and Technology at Los Alamos National Laboratory

Research in the emerging field of nanoscale science and technology has grown steadily at Los Alamos National Laboratory since 1990. This article summarizes some of this work, examining research highlights within the seven key categories of nanoscience in which Los Alamos has ongoing projects, capabilities, and facilities: (1) Materials and chemistry, (2) Theory and modeling, (3) Bioscience, (4) Investigative tools and facilities, (5) Sensors and devices, (6) Synthesis and fabrication, and (7) Education and outreach. Future research horizons are indicated throughout while institutional strategies for advancing nanoscale science are summarized at the end.     

基于多载波的宽带无线接入策略的研究

呼叫接入控制是无线通信中保证用户服务质量的关键技术之一。本文提出了一种在多业务环境下,基于多载波通信的优先强占接入策略:当剩余无线资源不能接纳实时业务的呼叫时,实时业务呼叫强占部分非实时业务占用的子载波来保证实时业务的接入,与此同时增加了非实时业务的传输时延。本文通过二维Markov链模型对系统进行了建模和性能参数(呼叫阻塞概率及系统频带利用率)的求解。通过与保护信道策略和无优先策略的比较可以看到:优先强占策略将接入控制和服务质量保证有机地结合在一起,既保证了用户的QoS,又大大降低了系统中的实时业务用户的呼叫阻塞概率,提高了系统资源的利用率。     

Robust Optimal Stopping-Time Control for Nonlinear Systems

Abstract. We formulate a robust optimal stopping-time problem for a state-space system and give the connection between various notions of lower value function for the associated games (and storage function for the associated dissipative system) with solutions of the appropriate variational inequality (VI) (the analogue of the Hamilton—Jacobi—Bellman—Isaacs equation for this setting). We show that the stopping-time rule can be obtained by solving the VI in the viscosity sense and a positive definite supersolution of the VI can be used for stability analysis.